Fix main module path for nvim-treesitter

[subh3ndu]

The above error is I was getting while installing kickstart.nvim in windows terminal (Git bash), changing `nvim-treesitter.configs` to `nvim-treesitter.config` fixes the error.

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NOTE
Please verify that the base repository above has the intended destination!
Github by default opens Pull Requests against the parent of a forked repository.
If this is your personal fork and you didn't intend to open a PR for contribution
to the original project then adjust the base repository accordingly.

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[techieshark]

Confirming this change fixes the issue here: #1802

[bewuethr]

Duplicates: #1795, #1748

[xiechunyao]

changing .configs to .config only suppress the error messages, but Treesitter doesn't actually function properly. For the fastest fix that actually works, just add branch = 'master'. more info: #1802 (comment)